If your numbers are not integers then they are double precision which means 8 bytes per number. In such a case you will need 86000*2500*8 = 1.7Gb of memory (plus a small amount for book keeping). You will need more (and sometimes much more) if you intend to do some operations on your arrays). So you probably will need a 64 bit machine with enough RAM. Integer arrays will take 4 bytes per entry, so about half that amount.
Regards, Moshe. --- Federico Calboli <[EMAIL PROTECTED]> wrote: > Hi All, > > is there a way of predicting memory usage? > > I need to build an array of 86000 by 2500 numbers > (or I might create > a list of 2 by 2500 arrays 43000 long). How much > memory should I > expect to use/need? > > Cheers, > > Fede > > -- > Federico C. F. Calboli > Department of Epidemiology and Public Health > Imperial College, St. Mary's Campus > Norfolk Place, London W2 1PG > > Tel +44 (0)20 75941602 Fax +44 (0)20 75943193 > > f.calboli [.a.t] imperial.ac.uk > f.calboli [.a.t] gmail.com > > ______________________________________________ > R-help@r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide > http://www.R-project.org/posting-guide.html > and provide commented, minimal, self-contained, > reproducible code. > ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
